<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>四舍五入</title>
  <script src="./vue.js"></script>
  <style>
      * {
                padding: 0;
                margin: 0;
            }
      </style>
</head>

<body>
  <div id="app">
    <h2>四舍五入</h2>
    <input type="text" v-model="price" />
    <h2>{{price | filter}}</h2>
  </div>
  <script>
    new Vue({
      el: "#app",
      data: {
        context: "",
        price: 0
      },

      filters: {
        filter: function (value) {
          if (value == '') return
          return parseFloat(value).toFixed(2) + "元";
        }
      }
    })
  </script>
</body>
</html>